Sadness. This is the reply from Chessex. I guess have to ditch this project dy.

Hello again,

You have put me in a tough position. I really want to help you withyour project, but those designs are still obviously the four ChaosGods designs from Games Workshop which means that they are stillviolations of their design. They are different, but stillrecognizable for what they are. The copyright laws are nebulous abouthow different the image has to be in order to be a different image,but I would have a hard time defending these images if we drew the ireof their lawyers again.

The generic eight pointed chaos star design is not owned by GW. Ifyou are intent on making dice for your chaos armies, the only realoptions would be to come up with entirely new designs or use designsthat are part of the common property, such as the previously mentionedstar. Is this an option?